Inventory that makes up 15 percent of your total sales should be classified as B and remaining inventory of 5 percent, classified as C. As with a number of things, repair shop advertising was once a lot easier than it is today. Go to the internet sites of all the retailers in and all around your locality, gather facts and evaluations, pay a visit to a few of them personally, shop all around for costs, and last but not least, hand more than your i - Phone to the best one for repair.